The manufacturer will tell you about the hidden dangers of laying glass fiber reinforced plastic bridges.
First, the bottom of the ditch of the glass fiber reinforced plastic bridge is uneven, and there are sharp hard objects such as hard soil blocks and stones that obstruct the pipeline.
Generally speaking, the trenches in low-lying areas are all mechanically excavated. Due to the low terrain, the bottom of the trench is wet or watered, and there is a high possibility of hard objects, mainly hard objects such as gravel, bricks and obstacle pipelines. In particular, there is a large amount of water on the pipe trench. When these hard objects exist below the water surface, it is not easy to find them. After the glass fiber reinforced plastic bridge
is directly backfilled after the installation on the water surface, the glass fiber reinforced plastic bridge is directly pressed on the hard object. Maybe it will not be damaged due to the looseness of the backfill soil in a short time, but due to the subsidence and compaction of the backfill soil, after the glass fiber reinforced plastic bridge is put into production, The internal pressure of glass fiber reinforced plastic bridge and the internal liquid flow cause micro vibration of glass fiber reinforced plastic bridge. With the increase of time, the point load caused by the hard object on the glass fiber reinforced plastic bridge becomes larger and larger, and the point where the glass fiber reinforced plastic is affected by the hard object will be damaged. . In addition, the unevenness of the bottom of the trench will cause uneven force on the glass fiber reinforced plastic bridge. When backfilling, stress concentration will occur in the raised place. Damage to FRP bridges or unnecessary wear. This kind of wear is more severe when there is pulsating pressure in the FRP bridge system.
Second, a lot of water in the trench and the collapse of the trench.
Ground engineering construction usually catches up with the rainy season. Due to the low-lying terrain of the construction site, there is a large amount of water in the trench after the excavation, and the deepest site can reach more than 1.0m. Due to the light weight of the high-pressure glass fiber reinforced plastic bridge, the glass fiber reinforced plastic bridge floats on the water after being installed in the trench. Due to the buoyancy of water, it is difficult to press the glass fiber reinforced plastic bridge into the bottom of the ditch with soil during backfilling, which causes the buried depth of the glass fiber reinforced plastic bridge to fail to meet the design requirements. In addition, because there is too much water in the ditch, it is difficult to grasp the flatness of the ditch bottom, and it is difficult to see whether there are obstacles such as pipelines and gravel at the bottom of the ditch, and it is difficult to ensure the construction quality of the glass fiber reinforced plastic bridge. Water accumulation in pipe trenches in low-lying areas can easily lead to the collapse of pipe trenches, and the massive earthwork that falls down often hits the glass fiber reinforced plastic bridge directly, smashing the pipeline.
Third, the impact of hard objects such as stones and mechanical backfill in the trench backfill.
The backfill soil in low-lying areas is relatively wet, and even some of them are basically in the form of mud. During the backfill process, if the mud is mixed with hard objects such as stones, it is difficult to find. These stones are buried in the bottom of the ditch and directly connected to the glass fiber reinforced plastic bridge. Contact will cause great harm to FRP bridges. It is also possible that during the backfilling process, the glass fiber reinforced plastic bridge line was directly damaged under the impact of gravity due to the large stones. During mechanical backfilling, the soil from the full bucket is backfilled directly into the trench from a high place, and the pipeline will be damaged due to the large impact force.
4. Other factors, such as irregular operation of construction personnel.
During construction, due to the harsh construction environment in the low-lying area, the construction personnel did not operate in accordance with the specifications. For example, when the fiberglass bridge is connected, the muddy water in the threaded part is not erased, the screwing depth is not sufficient, and water, mud and other debris in the fiberglass reinforced plastic bridge. In addition, construction personnel throw tools at will, which is particularly easy to hurt the glass fiber reinforced plastic bridge. These details are hidden dangers in the construction of high-pressure fiberglass bridges.